Fix some obsolete documentation in CostFunction::Evaluate
Fix some obsolete documentation in CostFunction::Evaluate

Change-Id: I1d7ee5c596fbf6a4d886dce5b989c8eb18af2dce

DougFirErickson/ceres-solver,ysonggit/ceres-solver,DougFirErickson/ceres-solver,whuaegeanse/ceres-solver,entylop/ceres-solver,kartikkumar/ceres-solver,kartikkumar/ceres-solver,whuaegeanse/ceres-solver,ysonggit/ceres-solver,stonier/ceres_solver,stonier/ceres_solver,ysonggit/ceres-solver,stonier/ceres_solver,whuaegeanse/ceres-solver,entylop/ceres-solver,entylop/ceres-solver,ysonggit/ceres-solver,kartikkumar/ceres-solver,stonier/ceres_solver,DougFirErickson/ceres-solver,whuaegeanse/ceres-solver,entylop/ceres-solver,DougFirErickson/ceres-solver,kartikkumar/ceres-solver